package com.firefly.admin.common.utils;

import com.alibaba.fastjson.JSONArray;
import org.bouncycastle.crypto.digests.SM3Digest;
import org.bouncycastle.crypto.macs.HMac;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.pqc.math.linearalgebra.ByteUtils;

import java.nio.charset.StandardCharsets;
import java.security.Security;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

public class Sm3Util {

    static {
        Security.addProvider(new BouncyCastleProvider());
    }

    /**
     * sm3算法加密
     *
     * @param paramStr 待加密字符串
     * @return 返回加密后，固定长度=32的16进制字符串
     * @explain
     */
    public static String encrypt(String paramStr) {
        // 将返回的hash值转换成16进制字符串
        String resultHexString = "";
        // 将字符串转换成byte数组
        byte[] srcData = paramStr.getBytes(StandardCharsets.UTF_8);
        // 调用hash()
        byte[] resultHash = hash(srcData);
        // 将返回的hash值转换成16进制字符串
        resultHexString = ByteUtils.toHexString(resultHash);
        return resultHexString;
    }

    /**
     * 返回长度=32的byte数组
     *
     * @param srcData
     * @return
     * @explain 生成对应的hash值
     */
    public static byte[] hash(byte[] srcData) {
        SM3Digest digest = new SM3Digest();
        digest.update(srcData, 0, srcData.length);
        byte[] hash = new byte[digest.getDigestSize()];
        digest.doFinal(hash, 0);
        return hash;
    }

    /**
     * sm3算法加密
     *
     * @param paramStr 待加密字符串
     * @param key      密钥
     * @return 返回加密后，固定长度=32的16进制字符串
     * @explain
     */
    public static String encryptPlus(String paramStr, String key) {
        // 将返回的hash值转换成16进制字符串
        String resultHexString = "";
        // 将字符串转换成byte数组
        byte[] srcData = paramStr.getBytes(StandardCharsets.UTF_8);
        // 调用hash()
        byte[] resultHash = hmac(srcData, key.getBytes(StandardCharsets.UTF_8));
        // 将返回的hash值转换成16进制字符串
        resultHexString = ByteUtils.toHexString(resultHash);
        return resultHexString;
    }

    /**
     * 通过密钥进行加密
     *
     * @param key     密钥
     * @param srcData 被加密的byte数组
     * @return
     * @explain 指定密钥进行加密
     */
    public static byte[] hmac(byte[] key, byte[] srcData) {
        KeyParameter keyParameter = new KeyParameter(key);
        SM3Digest digest = new SM3Digest();
        HMac mac = new HMac(digest);
        mac.init(keyParameter);
        mac.update(srcData, 0, srcData.length);
        byte[] result = new byte[mac.getMacSize()];
        mac.doFinal(result, 0);
        return result;
    }

    /**
     * 判断源数据与加密数据是否一致
     *
     * @param srcStr       原字符串
     * @param sm3HexString 16进制字符串
     * @return 校验结果
     * @explain 通过验证原数组和生成的hash数组是否为同一数组，验证2者是否为同一数据
     */
    public static boolean verify(String srcStr, String sm3HexString) {
        boolean flag = false;
        byte[] srcData = srcStr.getBytes(StandardCharsets.UTF_8);
        byte[] sm3Hash = ByteUtils.fromHexString(sm3HexString);
        byte[] newHash = hash(srcData);
        if (Arrays.equals(newHash, sm3Hash)) {
            flag = true;
        }
        return flag;
    }

    public static void main(String[] args) {
        Map<String, String> test = new HashMap<>();
        for (int i = 0; i < 2; i++) {
            test.put("test" + i, "test" + i);
        }
        System.out.println(JSONArray.toJSONString(test));
    }
}
